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| 1 | let compatiblePreferences = rawValues.filter { defaults[$0.key] != nil }
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| 2 | rawValues = defaults.merging(compatiblePreferences) { (_, new) in new }
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| 3 | ||
| 4 | // My understanding is that Swift lambdas can have anonymous parameters: | |
| 5 | ||
| 6 | rawValues.filter { // no named lambda parameter here
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| 7 | defaults[$0.key] != nil | |
| 8 | } | |
| 9 | ||
| 10 | // or named parameters | |
| 11 | ||
| 12 | rawValues.filter { value in // `$0` is named value and `in` is used to finish statement
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| 13 | defaults[value.key] != nil | |
| 14 | } | |
| 15 | ||
| 16 | // That helps us understand the second line: | |
| 17 | ||
| 18 | defaults.merging(compatiblePreferences) { (_, new) in new }
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| 19 | ||
| 20 | // It can be reformatted as: | |
| 21 | ||
| 22 | defaults.merging(compatiblePreferences) { (_, new) in // 2 names parameters for the conflicting values of both lists; note that `_` tells Swift to ignore the first parameter; we don't need it so we don't name it
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| 23 | - | new // implicit `return` of new -> we always pick new value on conflicting key |
| 23 | + | new // implicit `return` of new -> we always pick new value on conflicting key |
| 24 | } |
